<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input
              type="checkbox"
              :checked="isAll"
              v-model="isTrue"
              @change="isAllTrue"
            />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <BugSome :arr="goodList" @del="delFn" />
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">
            {{ allPrice }}
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import BugSome from "./components/BugSome.vue";
export default {
  data() {
    return {
      isTrue: "",
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    BugSome,
  },
  computed: {
    isAll() {
      return this.goodList.length != 0 ?this.goodList.every((item) => item.checked): false
      ;
    },
    allPrice() {
      return this.goodList.reduce((sum, obj) => {
        if (obj.checked === true) {
          return (sum += obj.price * obj.num);
        }
        return sum;
      }, 0);
    },
  },
  methods: {
    isAllTrue(e) {
      // console.log(e);
      return this.goodList.forEach((item) => (item.checked = e.target.checked));
    },
    delFn(index) {
      this.goodList.splice(index, 1);
    },
  },
};
</script>

<style>
</style>